Worm and tap grinder



March 31, 1931. E. aucKlNGHAM WORX AND TAP GRINDER Filed sept. 2; 1927 8 Sheets-Sheet 1 mm E Tilln .l TTURNE v Mardi 31,. 1931. E, BUCK|NGHAM 1,798,832

WORM AND TAP GRINDER Filed Sept. 2. 1927 8 Sheets-Sheet 2 Mardi 31, 193k E.'BucK|NG|-|AM wom: AND TAP GRINDER Filed Sept. 2, 1927 8 Sheets-Sheet 3 A mv /vron Sa/da Uranus! March 3l, 1931. E, BUK|NGHAM 1,798,832

WOR! AND TAP GRINDER Filed Sept. 2, 1927 8 Sheets-Sheet 4 lml fron l TTOIMEY Saab;

WORK AND TAP GRINDER Filed Sept. 2, 1927 8 Sheets-Sheet 5 Arromvr March 3l, 1931. E. BUCKINGHAM 1,798,832

WORN AND TAP GRINDER med sept. `2. 1927 s sheets-'sheet e 79 Maa libjuroz A A TTOHNE Much 31, 1931 E. BucKlNGl-IAM 1,798,832

' worm AND TAP GRINDER Filed Sept. 2. 1927 8 Sheets-Sheet 7 5%. mffwbmv' March 3l, 1931. E. BUCKINGHAM I WORM AND TAP` GRINDER Filed sept. 2*. 1927 8 Sheets-Sheet 8 er Z y l TTU/MEV Patented Mar. 3l, 1931 EARLE BUCKINGHAM, F BELMONT, MASSACHUSETTS WORM .AND TAP GRINDER Application filed September 2, 1927. Serial No. 217,247.

This invention relates to screw thread grinding machines and in particular to a semi-automatic thread grinding machine adapted particularly for small taps and 5 worms.

An object of the present invention is to provide a production machine for grinding threads of either single or multiple start to a high degree of precision with a relatively simple and easily operated machine.

Another object of the invention is to provide a thread grinding machine adapted to be automatic in its operation, mechanism being provided to stop operation of the machine after a predetermined cycle of operations and to simultaneously move the work support and work away from the wheel.

Another principal object of the invention is to provide the machine with a detachable.

fixture upon which may .be mounted the work supporting and rotating mechanism, this fixture being provided with cams for effecting the longitudinal movement of the work past the wheel and with cams to effect movement of the work toward and from the wheel.

Another object of the invention is to provide simple means permitting removal of the fixture supporting the work as a unit and substitution of another fixture adapted for or adjusted for operations upon another form of blank.

Another object of the invention is to provide the :fixture with a relieving cam preferably rotatable directly with the work spindle for effecting slight oscillatory movements of the work toward and from the wheel in timed relation to and a plurality of times during the work rotation.

Another object of the invention is to prof vide a template or guide member for controlling the position of the work support relative to the wheel adapting taper or other forms of screw threads to be ground, this template or guide member being moved very slightly to permit feeding movement of the work relative to the wheel and to move the work into and out of operative relation to the wheel.

A further object of the invention is to provide mechanism permitting manual oscillation of the work toward and from the wheel simultaneously with engagement or disengagement of a main driving clutch.

With these and other objects in view, my invention consists in the features of construction and operation set forth in the following I specification and illustrated -in the accompanying drawings.

In the accompanying drawings annexed hereto and forming a part of this speciication, I have shown my invention embodied in a machine adapted primarily for grinding a multiple start worm of small size, but it will be understood that the invention can be otherwise embodied and that the drawings are not to be construed as deining or limiting the scope of the invention, the claims appended to this specification being relied upon for that purpose.

In the drawings:

Figure l is a front elevation of the complete machine.

Fig. 2 is a front elevation of the machine with the work supporting and rotating mechanism shown in section to more clearly illustrate their construction.

Fig. 3 is a plan view of the complete machine shown in Figs. l and 2.

Fig. 4 is a transverse sectional view taken substantially upon line 4 4 of Fig. 3. 80 Fig. 5 is a transverse sectional view taken substantially on line 5 5 of Fig. 3 showing the wheel support-ing and adjusting mechamsm.

Fig. 6 is a front vertical sectional view of 85 the wheel supporting head and spindle.

Fig. 7 is a side elevation of the complete machine taken from the left-hand side as viewed in Fig. l.

Fig. 8 is a detail fragmentary view of the 90 automatic stopping mechanism for the machine.

Fig. 9 is a transverse sectional view taken upon line 9 9 of Fig. 3.

Fig. l0 is a detail plan view of the work 95 driver and cams operated thereby for forming relieved threads.

Fig. 11 is a similar plan view of a form of the invention used for work blanks as shown in the drawings.

Fig. 12 is a transverse sectional View of the head-stock taken upon the line 12-12 of Fig. 2.

Fig. 13 is a transverse sectional view through the tailstock taken upon line 13-13 of Fig. 2, and

Fig. 14 is a detail side view of a relieving cam and member actuated thereby employed when grinding relieved threads.l

In the above mentioned drawings I have shown but one embodiment, and a slightly modified form thereof, of the invention which are now deemed preferable, but it is to be understood that changes and modifications may be made within the scope of the appended claims without departing from the spirit of the invention.

Briefly, and in its broadest aspect, my invention comprises the following principal parts: First, a base or bed; second, work supporting and rotating means slidably mounted upon the bed upon suitable bearings permitting oscillatory movement of the work toward and from the wheel; third, a wheel head adapted to support a rotatably mounted abrasive wheel and permit adjustment of the wheel toward and from the work; fourth, cam means operated by the work rotating means adapted to reciprocate the work support longitudinally past the abrasive wheel; fifth, cam means rotatable with the cam for reciprocating the work for effecting oscillatory movements of the work support and work toward and from the wheel at the ends of its reciprocatory movements; sixth, cam means to permit feeding movement of the work towardthe wheel, to withdraw the work from the wheel and to stop operation of the machine at the end of a predetermined cycle of operations; and seventh, manual means to simultaneously operate a main driving clutch and the work oscillating means.

Referring more in detail to the figures of the drawings, I provide a base 10 on which are provided suitable bearings 11 of large size at either end. lMounted in these bearings 11 is an elongated shaft 12 suitably held against endwise movement but permitted to oscillate. Mounted on this shaft 12 between the bearings 11 is a body member 13 slidable along the shaft 12 upon suitable squared portions 14 thereof. The mechanism associated with this body member 13 will presently be described.

Also mounted on the base 10 is a wheel slide 15 movable along ways 16 disposed at right angles to the axis of the shaft 12 supporting the body member 13. Mounted on this slide 15 is a wheel head 17 of any usual or conventional form within which is mounted a rotatable wheel spindle 1S having an abrasive wheel 19 mounted at one end. In the present form ofthe invention the wheel spindle 18 is held Xed in one oblique position. It is stock 3l.

to be understood, however, that a wheel head 17 of any desired form adapted to support the abrasive wheel 19 at any oblique or other angle may be used for the one shown. In order to drive this spindle 18 at relatively high speed, a pulley 20 is mounted upon the end opposite the abrasive wheel 19 which may be rotated by a belt from any suitable driving shaft (not shown). During operation the wheel is maintained in fixed position.

In order to adjust the wheel 19 toward or from the work support formed by the body member 13 to adapt the machine for different sizes of work and to compensate for the reduction in diameter of the wheel 19 due to wear, a screw 21 is provided rotatably mounted but held against endwise movement in a suitable bracket 22 secured to the rear of the base 10 of the machine. This screw 21 engages a nut 23 fixed to the wheel slide 15 so that by rota-ting the screw 2l the wheel 19 may be adjusted to any desired position.'

Normally holding the wheel 19 as far rearwardly as possible is a coil spring 24 housed within the wheel slide 15. This spring 24 is attached at one end to a pin 25 secured within the base and at its opposite end to a pin 26 on the wheel slide 15.

To rotate the screw 21 to effect adjustments of the wheel 19 and wheel slide 15, the screw 21 is provided with a large spur gear 27 keyed directly thereto and in mesh with a spur gear 28 on the rear end of a forwardly extending shaft 29. This latter shaft 29 extends to the front wall of the base l0 and is provided with a graduated hand Wheel 30 keyed thereto. It will be seen, therefore, that rotation of the hand wheel 30 will effect movement of the wheel 19 toward or from the work IV. Graduations upon the periphery of the hand wheel 30 facilitate precision adjustments of the wheel 19.

Reference will now be made to the body member 13 and to the work supporting and actuating means associated therewith. Mounted within the head stock of the body member 13 is a work rotating spindle 32 having work engaging and driving means 33 adjacent one end. A pulley 34 drivingly connected to the spindle 32 at the opposite end provides means for rotating the Work spindle 32 and work WV at a relatively slow speed. A tailstoek 34a having an adjustable center 35 of any usual or conventional form is also provided on the body member 13 adapted to support the outer end of the work V.

Mounted on this work spindle 32 is a helical gear 36 in mesh with a helical gear 37 on a transversely extending shaft 38 below the spindle 32 and suitably supported in the head- On this latter shaft 38 at one end is a peripheral cam 39 which may be keyed directly thereto and upon the opposite end of the shaft is a face cam 40 also directly keyed thereto. The ratio between the helical gears 36 and 37 is such that a predetermined number of revolutions of the work spindle 32 will rotate the shaft 38 together with the cams 39 and 40 through one complete revolution. Adapted to engage the periphery of the cam 39 on this transverse shaft 38 is a roller 41 mounted on an arm 42 secured in fixed position to the oscillatory shaft 12 on which the body member 13 is slidable. A spring 43 disposed between the face of this bracket 42 supporting the roller 41 and a face of the work support 13 holds the work support 13 as far as possible in a direction to maintain the periphery of the cam 39 always in contact with the roller 41. It will be seen from the above that rotation of this cam 39 due to the cam contour of its periphery will cause the work support 13 to be reciprocated along the oscillatory shaft 12 and therefore will traverse the work support 13 and work l/V past the wheel 19 in timed relation to its rotation. It will be understood that a portion of the cam surface of this peripheral cam 39 will be accurately formed so as to give a uniform linear velocity to the work support 13 past the wheel 19 during the time that the work W 1s in engagement with the wheel 19.

The face cam 40 mounted upon the opposite end of the shaft 38 driven by the work spindle 32 engages a spring pressed plunger 44, the spring normally tending to hold the head of the plunger 44 in contact with the face of the cam 40. The opposite end of the plunger 44 is adapted to engage a template or forming plate 45, presently to be described, when the cam 40 is in a certain rotative position.

l/Vhen the cam 40 engages and forces the plunger 44 against the pressure of its spring, toward the template 45, the body member 13 and the work WV will be forced away from the wheel 19. The cam 40 is so formed and adjusted relative to the cam 39 that the work WV may engage the wheel 19 when the work WV is being moved in one direction by the cam 39. When the work WV is being moved in the opposite direction the body member 13 will be oscillated so that the work lV is out of engagement with the wheel 19. Continual rotation of the work spindle 32 and the cams 39 and 40 will therefore cause the work lV to be reciprocated past the wheel 19 simultaneously with its rotation. Also the work V will be in engagement with the wheel while moving in one direction and will be moved out of engagement therewith while moving in the opposite direction.

For forming radially relieved threads upon work mounted upon the work spindle 32 a special relieving cam 46 may be mounted directly upon the work spindle 32 and fixed thereto. The periphery of this cam 46, which is shown clearly in Fig. 14. is adapted to contact with the end of a spring pressed plunger 47, the opposite end of which bears against the surface of the template or guide member 45. Vith this cam 46 on the spindle 32 and the plunger 47 in operative position, the body member 13 will be alternately oscillated toward and from the wheel 19 a plurality of times duringthe rotation of the work spindle 32. The particular form of the template or guide plate 45 shown in Fig. 10 is adapted to form axially tapered screw threads by engagement of the plunger 47 spindle and also passes over idler pulleys 56 il and 57. As shown in Fig. 7 the idler 57 rotates about a stud on a swinging frame 58 forced by a spring 59 in a direction to hold the belt 50 in tension. By this construction the body member 13 is resiliently forced toward the wheel 19 but permitted to oscillate during operation under the influence of cams 40 and 46. As shown in Figs. 3 and 4, a main driving clutch 60 is provided, the stepped pulley 54 being free to revolve upon the shaft 52 when the clutch 60 is in its disengaged position. `When the clutch 60 is engaged rotation of the stepped pulley 54 drives the shaft 52 at a predetermined or desired speed.

On the outer end of the main driving shaft 52 is a pinion 62 in mesh with an intermediate gear 63 keyed directly to a second gear 64 in mesh with a gear 65 on a short shaft 66 within the base 10. This shaft 66 has mounted thereon a worm 67 which, as shown in Fig. 9, is keyed directly thereto and meshes with a worm wheel 68. Worm wheel 68 is pinned directly on a forwardly extending shaft 69. On this shaft 69 is a projection 70 adapted to engage a pin 71 on an oscillatory member 72 suitably supported within the base 10. Movement of this oscillatory member 72 by rotation of the shaft 69 through means shown in Fig. 8 forces the main driving clutch 60 to its inopera-4 tive position. The projection 70, as shown in Fig. 8, is secured to the shaft in a manner to permit limited oscillatory movement. A pin 7'3 extending through the shaft 69 extends through wide slots in the hub portion of the projection 70. A spring 74, one end of which engages a pin outstanding from the hub of the projection 70 and the other end the worm wheel 68, holds the projection 70 normally in one position. After the projection 70 engages the pin 71 and has oscillated the member 72, the spring 74 returns the projection 70 to its normal position so that the clutch 60 can be again manually engaged (see Fig. 8). Oscillation of the member 7 2 moves a reach arm 75 in one direction by engagement of the member 7 2 with a pin 7 6 on the reach arm 7 5. Reach arm 7 5 is connected to the main clutch 60 through a lever 7 7 and yoke 7 8 engaging the clutch 60. Both the lever 77 and yoke 7 8 are keyed directly to a shaft 7 9.

As the gear connections 62, 63, 64 and 65 between the main driving shaft 52 and the worm shaft 66 are mounted upon the outer ends of their shafts, they are adapted to be readily removed so that others of different ratio may be substituted. By this means, with the appropriate gears upon their shafts, a predetermined number of revolutions of the main driving shaft 52 and consequent-ly of the work spindle 32 will be required to rotate the worml wheel 68 one complete revolution. The purpose of this is to permit the cycle of operations to include any number of traverses and rotations of the work 7 past the wheel 19 during a single rotation of the worm wheel 68 so that the machine will not be stopped until a predetermined cycle of operations has been completed and a screw thread completely ground.

In order to manually oscillate the shaft 79 on which the yoke 7 8 is mounted to actuate the main clutch 60, a lever 8O on the inner end of a shaft 81 is provided. This lever 8O engages the end of the reach arm 75. Upon the forward end of shaft 81 is a hand lever 82. Oscillation of this lever 82 effects engagement or disengagement of the main driving clutch 60 by a single movement of the hand lever 82 in one direction.

As it is desired to oscillate the work support 12S-completely away from the wheel 19 when the machine is out of operation to enable removal and remounting of work V and dressing operations of the wheel 19, means are provided to simultaneously oscillate the work support 13 when the main clutch 60 is moved to operative or inoperative position. For this purpose the forwardly extending shaft 81 is provided with a. bevel gear 83 in mesh with a corresponding bevel gear 84 on a longitudinal shaft 85 within the base. The opposite end of this shaft 85 is provided with a spur gear 85SL meshing with a similar gear 85b on a shaft 89. The outer end of this shaft 89 is provided with a gear 86 meshing with an intermediate gear 87, which in turn meshes with a. gear 88 on the outer end of the oscillating shaft 12 on which the work support 13 is mounted. It will be seen from this mechanism that movement of the hand lever 82 to oscillate the shaft 81 to move the clutch 60 to operative or vinoperative position or movement of the reach arm 75 by the projection to move the clutch 60 to inoperative position will simultaneously oscillate the work support 13. The movement is such that when the clutch 60 is moved to its engaged position the work support 13 is oscillated directly toward the wheel 19 until the plungers 44 and 47 contact with their abutments 45. lVhen the clutch 60 is moved to its inoperative position the work support 13 is oscillated through a large are away from the wheel 19.

In order to limit the oscillatory movement of the body member 13 toward the wheel 19 the spring pressed plunger 44 provided on the work support 13 and outstanding from a rear surface of the work support contacts with the template or guide member 45. Preferably and as shown in Fig. 4, two templates 45 are employed one directly above the other. The lower template is adapted to be permanently secured in position, as the same form may be used for different forms of work. The function of this template or guide is to move the work lV toward and from the wheel in timed relation to its reciprocatory movement by movement of the plunger 44 induced by the cam 40. The upper template 45 may be given a curved or straight guiding surface either parallel or oblique relative to the axis of the work spindle 32 in accordance with the contour of the work being ground. The plunger 47 during operation of the machine engages the front surface of the upper template or guide 45 which is mounted together with the lower template 45 upon a slide 90 movable toward and from the work support 13. For taps and worms without taper or other longitudinally curved form, this upper guide 45 will, of course, be a plane surfacebut it is obvious that the guide or template may be suitably formed to oscillate the work support slightly during its longitudinal movement to form threads of taper or other longitudinal form.

As shown in Fig. 4, the rearward position of the slide 90 carrying the guides or templates 45 is controlled by a. screw 91 projectmg from the base 10 and engaging the rear wall of this slide 90, suitable nuts being provided on this screw 91 taking up against this portion of the slide and limiting its rearward movement. Springs 92 housed within the base 10 force the slide 90 as far as possible toward the rear.

To oscillate the work support 13 away from the wheel 19 at the end of a cycle of operation and to permit slight oscillatory movements of the body member 13 during operation to effect feeding movements of the work WV toward the wheel 19, the slide 90 is moved slightly forwardly. This movement is effected by a face cam 94 provided on the same shaft 69 as the worm wheel 68 and keyed or otherwise secured directly thereto. This cam 94 has a contour on one face forming a slight but continuously decreasing height for a major portion of its periphery. During rotation of this cam 94, therefor, the body member 13 will be permitted to oscillate very slightly toward the wheel 19. This slight oscillatory movement of the body member 13 feeds the work W toward the wheel during the grinding operation. As soon as the cycle of operation of the machine is completed a projecting portion 96 of the face cam 94 strikes the roller 95 and forces the slide 90 forwardly, thus forcing the lower guide plate 45 to move the plunger 44 and oscillate the work support 13 away from the wheel 19.

A spring 98 may be provided within the base 10 to aid the tension of belt 50 in forcing the body member 13 toward the wheel 19. This is fragmentarily shown in Figs. 1 and 4. One end of the spring 98 is attached to a lever 99 pinned to the shaft 89. The opposite end of the spring 98 is attached as shown in Fig. 3 to the rear wall of the base. It will be seen from Fig. 4 that oscillation of the lever 82 and consequently of the shaft 85 that the spring 98 passes the aXis of shaft 89. Thereupon the contraction of spring will still further force rotation of shaft 89 and thus oscillate the body member 13 from the wheel 19. lVith the spring 98 so positioned, the body member 13 will be resiliently held away from the wheel 19 until the lever 82 is manually oscillated to start operation of the machine.

When work lV without radial relief such as is shown in the drawings is being operated upon it is not necessary to employ the relief cam 46. This cam may therefore be omitted together with its plunger 47 and an ad]ustable abutment 100 suitably threaded into the body member 13 may be substituted.

As stated above, when operating upon threads having a single start, one rotation of the shaft 38 is effected in an integer number of revolutions of the spindle 32. For threads of multiple start the spindle 32, when shaft 38 has rotated a complete revolution, must have completed an integer number of revolutions plus a fraction so that the successive threads will each be properly engaged and ground by the wheel.

In operation after the work lV has been mounted in position on the spindle 32 the hand lever 82 is operated in a direction to oscillate the supporting frame 13 toward the wheel 19. This movement of the hand lever 82 also moves the clutch 60 to its engaged osition to start rotation of the main driving shaft 52. Rotation of this shaft 52 rotates the spindle 32 through the belt 34 and also through geared connections rotates the worm 67 and the worm wheel 68.

Rotation of the spindle rotates the cam shaft and the cams 39 and 40 which effect longitudinal movement of the work lV past the wheel 19 and also oscillatory movement of the work lV toward and from the wheel 19.

Both of these movements of the work W are controlled by and in timed relation to its rotation.

Rotation of the worm wheel 68 and the cam 94 rotating therewith slowly advance the templates 45 so that the work W will be gradually fed toward the wheel 19 during operation of the machine. This worm wheel 68 also rotates the projection 70 which, at the completion of the cycle of operation, actuates the clutch 60 so that it is moved to its disengaged position thus stopping the machine. This movement of the clutch 60 by the projection 70 rotated by the worm wheel 68 also oscillates the work support 13 away from the wheel 19 by the gearing 87 and 88. The machine is therefore stopped at the end of its cycle of operation with the parts in position for dismounting the finished work and placing a new blank in position upon the spindle 32.

lVhat I claim is: y

1. A grinding machine comprising in combination, a base, a wheel head mounted thereon and having a rotatably mounted abrasive wheel therein, a body member removably mounted on said base, cam means mounted on said body member to oscillate and reciprocate said body member, a template on said base controlling the oscillated position of said body member in different longitudinal positions, and means on said body member to support and rotate a work blank.

2. A grinding machine comprising in combination, a base, a wheel head mounted thereon and having a rotatably mounted abrasive wheel therein, a body member removably mounted on said base, cam means on said body member to oscillate and reciprocate said body member, means on said body member to support a work blank and rotate said work blank in timed relation to its oscillatory and reciprocatory movements, a template controlling the oscillated position of said body member, and driving connections between said work supporting and rotating means to effect oscillation and reciprocation of said body member. Y

3. A grinding machine comprising in combination, a base, a wheel head mounted thereon and having a rotatably mounted abrasive wheel therein, a body member comprising work supporting and rotating means mounted on said base, a shaft pivotally supporting said body member on said base and on which said body member is slidable, means to oscillate and reciprocate said body member in timed relation to the rotation of the work support, means to effect feeding movements of said body member during its cycle of operations, and means permitting removal of said work supporting, rotating and actuating means.

4. 'A grinding machine comprising in combination, a base, a wheel head mounted thereon and having a rotatably mounted abrasive Wheel therein, work supporting and rotating means on said base, means normally holding said supporting and rotating means to- Ward the Wheel, cam means to oscillate and reciprocate said supporting means in timed relation to the rotation of the Work, a template controlling the oscillated position of said supporting and rotating means, means to move said template during operation of said machine, and means to bodily remove said Work supporting, rotating and actuating means from the base as a unit.

5. A grinding machine comprising in combination, a base, a Wheel head mounted thereon and having a rotatably mounted abrasive wheel therein, Work supporting means on said base, Work blank rotating means thereon, reciprocating means for said supporting means, means to effect oscillatory movement of the supporting means in timed relation to the rotating means, a template controlling the oscillated position of said supporting means, and means to operate said reciprocating and oscillating means from said rotating'means, said supporting, rotating and oscillating means being bodily removable from said base as a unit.

6. A grinding machine comprising in combination, a base, a wheel head mounted thereon and having a rotatably mounted abrasive Wheel therein, a shaft rotatably mounted on said base and maintained against axial movement, a body member slidable on said shaf't, work supporting and rotating means on said body member, means on said body member driven from said rotating means to reciprocate said body member, means also driven from said rotating means to oscillate said body member in timed relation to its reciprocatory movement, and template means to vary the oscillated position of said body meniber when the supporting means are in different longitudinal positions.

7. A grinding machine comprising in combination, a base, a Wheel head mounted thereon and having a rotatably mounted abrasive Wheel therein, a shaft rotatably mounted on said base and maintained against axial movement, a body member slidable on said shaft, Work supporting and rotating means on said body member, means normally forcing said supporting and rotating means toward the Wheel, means on said body member driven from said rotating means to reciprocate said body member longitudinally, means. also driven from said rotating means to oscillate said body member in timed relation to its reciprocatory movement, and a template on said base limiting the oscillated position of said supporting and rotating means.

8. A grinding machine comprising in combination, a base, a Wheel head mounted thereon and having a rotatably mounted abrasive Wheel therein, a shaft rotatably mounted on said base and maintained against axial movement, a body member slidable on said shaft, Work supporting and rotating means on said body member, means on said body member driven from said rotating means to reciprocate said body member in timed relation to the rotation of the rotating means, means also driven from said rotating means to oscillate said body member in timed relation to its reciprocatory movement, and means movable on said base cooperating with said means to oscillate said body member to permit feeding movements of said body member toward the Wheel.

9. A grinding machine comprising in conibination, a base, a Wheel head mounted thereon and having a rotatably mounted abrasive Wheel, therein, a shaft rotatably mounted on said base and maintained against axial movement, a body member slidable on said shaft, Work supporting and rotating means on said body member, means on said body memberi-t driven from said rotating means to recipro-Y cate said body member, means driven from said rotating means to oscillate said body member in timed relation to its reciprocatory movement, means to oscillate said body member during the cycle of operation of the machine to elfect feeding movements ofthe work support toward the Wheel, and means to manually oscillate said shaft and body member independently of said abovementioned means.

10. A grinding machine comprising in combination, a base, a wheel head mounted thereon and having a rotatable abrasive Wheel therein, a detachable unit comprising a body member pivotally attached to said base, work rotating means thereon, cam means on said body member driven from said Work rotating means to simultaneously oscillate and reciprocate said body member, a template slidably mounted on said base, and cam means on said base adapted to actuate said template to oscillate said body member away from said wheel at the conclusion of a cycle of operations. v

11. A grinding machine comprising in combination, a base, a wheel head mounted thereon and having a rotatable abrasive wheel therein, a detachable unit comprising a body member pivotally attached to said base, Work rotating means thereon, cam means on said body member driven from said Work rot-ating means to simultaneously oscillate and reciprocate said body member, a template slidably mounted on said base, and cam means on said base adapted to actuate said template to oscillate said body member slightly during operation to effect feeding movements of the Work relative to the Wheel and to oscillate said body member away from said wheel at the conclusion of a cycle of operations.

12. A grinding machine comprising in combination, a base, a Wheel head mounted thereon and having a rotatable abrasive wheel therein, a detachable unit comprising a body member pivotally attached to said base, work rotating means thereon, cam means on said body member driven from said work rotating means to simultaneously oscillate and reciprocate said body member, a template slidably mounted on said base, and means on said base to actuate said template to elfect feeding movements of the work toward the wheel during operation.

13. A grinding machine comprising in combination, a base, a wheel head mounted thereon and having a rotatable abrasive wheel therein, a body member pivotally mounted on said base, work rotating means on said body member, an abutment on said base, means on said body member cooperating with said abutment for oscillating the body member toward and from the wheel, and means to effect a slight movement of said abutment during operation to effect feeding movement of the work relative to the wheel and to oscillate said body member away from said wheel at the end of cycle of operations.

14. A grinding machine comprising in combination, a base, a wheel head mounted thereon and having a rotatable abrasive Wheel therein, a body member pivotally mounted on said base, work rotating means on said body member, an abutment on said base, means on said body member cooperating With said abutment for oscillating the body member toward and from the wheel, cam means on said work rotating means to oscillate the work a plurality of times durino each rotation of the work, and means to effect movement of said abutment to oscillate said body member away from said Wheel.

15. A grinding machine comprising in combination, a base, a wheel head mounted thereon and having a rotatable abrasive wheel therein, a body member pivotally mounted on said base, work rotating means on said body member, cam means on said body member operated by said Work rotating means to effect oscillatory and reciprocatory movements of said body member, an abutment on said base, means cooperating therewith to effect oscillatory movements of said body member, and means to eifect movement of said abutment after a cycle of operatio-ns to oscillate said body member away from said wheel.

16. A grinding machine comprising in combination, a base, a wheel head mounted theron and having a rotatably mounted abrasive wheel therein, a body member removably mounted on said base, cam means mounted on said body member to oscillate and reciprocate said body member, a template on said base controlling the oscillated position of said body member in different longitudinal positions thereof, means to slowly move said template to effect feeding movements of work on said body member,

and means on said body member to rotate work thereon.

17. A grinding machine comprising in combination, a base, a wheel head mounted thereon and having a rotatably mounted 0 abrasive wheel therein, a body member comprising work supporting and rotating means mounted on said base, a shaft pivotally supporting said body member on said base and on which said body member is slidable, cams rotatably mounted and driven by said Work rotating means to oscillate and reciprocate said body member in timed relation to the rotation of the work supporting means, cam means on said base to effect feeding movements of said body member during its cycle of operations, and means permitting removal as a unit of said body member and parts mounted thereon.

In testimony whereof, I hereto aix my 85 signature. p EARLE BUCKINGHAM, 

